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<head><meta charset="utf-8"><title>weekly meeting 2020-04-30 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html">weekly meeting 2020-04-30 #54818</a></h3>

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<a name="195755160"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755160" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755160">(Apr 29 2020 at 19:02)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>; the triage meeting will be starting in ~ 20 hours</p>



<a name="195755350"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755350" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755350">(Apr 29 2020 at 19:03)</a>:</h4>
<p>The <span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> will be doing pre-triage in <a class="stream-topic" data-stream-id="227806" href="/#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/pre-meeting.20triage.202020-04-30.20.2354818">#t-compiler/wg-prioritization &gt; pre-meeting triage 2020-04-30 #54818</a></p>



<a name="195755450"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755450" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755450">(Apr 29 2020 at 19:04)</a>:</h4>
<p>During pre-triage we will be preparing the <a href="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view" title="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view">meeting agenda</a></p>



<a name="195755728"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755728" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755728">(Apr 29 2020 at 19:06)</a>:</h4>
<p>we will have checkins from Polymorphization WG and <span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span></p>



<a name="195755803"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755803" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755803">(Apr 29 2020 at 19:06)</a>:</h4>
<p><span class="user-mention" data-user-id="116107">@davidtwco</span> do you have something you want to share about Polymorphization?</p>



<a name="195755832"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755832" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755832">(Apr 29 2020 at 19:07)</a>:</h4>
<p>I can share some things about Prioritization</p>



<a name="195755852"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195755852" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195755852">(Apr 29 2020 at 19:07)</a>:</h4>
<p>I'll post an update in a moment - got an exam tomorrow so won't be around for the meeting.</p>



<a name="195756353"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195756353" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195756353">(Apr 29 2020 at 19:11)</a>:</h4>
<p>I can't remember where the polymorphisation work was last time I gave an update at the meeting, so to remind everyone, the polymorphisation working group is for tracking my master's project - implementing an analysis that will detect when generic parameters are unused, and then reducing monomorphisation as a result. </p>
<p><a href="https://github.com/rust-lang/rust/issues/69749" title="https://github.com/rust-lang/rust/issues/69749">#69749</a> has a working implementation of polymorphisation (I've paused working on it until my exams are over), which we've run perf on and gotten mixed results - there are some interesting interactions with LTO on one benchmark configuration, and some cases see 3-5% improvements, but some are worse-off (normally by 1-2%). There's probably some room for improvement yet.</p>



<a name="195792850"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195792850" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mark-i-m <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195792850">(Apr 30 2020 at 02:31)</a>:</h4>
<p>All the best on your exams!</p>



<a name="195839232"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195839232" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195839232">(Apr 30 2020 at 13:36)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>, triage meeting will be starting in ~ 23 minutes</p>



<a name="195839298"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195839298" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195839298">(Apr 30 2020 at 13:37)</a>:</h4>
<p><a href="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view" title="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view">Check out the meeting agenda</a></p>



<a name="195842613"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842613" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842613">(Apr 30 2020 at 14:00)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span>! Add a <span aria-label="wave" class="emoji emoji-1f44b" role="img" title="wave">:wave:</span> emoji to show you're here :)</p>



<a name="195842641"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842641" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842641">(Apr 30 2020 at 14:01)</a>:</h4>
<p>we will start off with 5 minutes for ...</p>



<a name="195842658"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842658" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842658">(Apr 30 2020 at 14:01)</a>:</h4>
<h2>Announcements</h2>



<a name="195842729"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842729" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842729">(Apr 30 2020 at 14:01)</a>:</h4>
<ul>
<li>There are 3 major changes proposals <ul>
<li>Implement LLVM-compatible source-based code coverage <a href="https://github.com/rust-lang/compiler-team/issues/278" title="https://github.com/rust-lang/compiler-team/issues/278">#278</a></li>
<li>illumos toolchain builds <a href="https://github.com/rust-lang/compiler-team/issues/279" title="https://github.com/rust-lang/compiler-team/issues/279">#279</a></li>
<li>Inline assembly <a href="https://github.com/rust-lang/compiler-team/issues/280" title="https://github.com/rust-lang/compiler-team/issues/280">#280</a></li>
</ul>
</li>
</ul>



<a name="195842832"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842832" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842832">(Apr 30 2020 at 14:02)</a>:</h4>
<p>(there was a point raised, btw, about whether we should wait for an MCP to be "seconded" before we announce it here.)</p>



<a name="195842968"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195842968" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195842968">(Apr 30 2020 at 14:02)</a>:</h4>
<p>(My current inclination is to go ahead and announce it here prior to it being seconded. But if things get out of control, we can revisit that later.)</p>



<a name="195843097"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843097" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843097">(Apr 30 2020 at 14:03)</a>:</h4>
<ul>
<li>We had a steering meeting last week where we discussed incorporating triage/maintenance of the implementation of Rust's libstd in our work here at T-compiler</li>
</ul>



<a name="195843281"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843281" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843281">(Apr 30 2020 at 14:04)</a>:</h4>
<p>the members present tentatively agreed to try doing so. Its worth noting that the representative from T-libs, <span class="user-mention" data-user-id="119235">@David Tolnay</span> , said that the main goal was to try to ease up the PR review burden</p>



<a name="195843390"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843390" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843390">(Apr 30 2020 at 14:05)</a>:</h4>
<p>but one example of a change that we have implemented in response to this is that we will be looking at T-libs backport nominations today</p>



<a name="195843441"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843441" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843441">(Apr 30 2020 at 14:05)</a>:</h4>
<p>speaking of steering meetings ... where are we on the schedule there ...</p>



<a name="195843550"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843550" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843550">(Apr 30 2020 at 14:06)</a>:</h4>
<ul>
<li>okay: no steering meeting scheduled for tomorrow</li>
</ul>



<a name="195843692"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843692" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843692">(Apr 30 2020 at 14:07)</a>:</h4>
<ul>
<li>we <em>do</em> have a <strong>planning</strong> meeting a week from tomorrow. So get your proposals in, at <a href="https://github.com/rust-lang/compiler-team/issues" title="https://github.com/rust-lang/compiler-team/issues">https://github.com/rust-lang/compiler-team/issues</a></li>
</ul>



<a name="195843778"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843778" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843778">(Apr 30 2020 at 14:08)</a>:</h4>
<p>So, okay, that's all the announcements <em>I</em> have</p>



<a name="195843797"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843797" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843797">(Apr 30 2020 at 14:08)</a>:</h4>
<p>lets move onto the <a href="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view" title="https://hackmd.io/TTunvbA1QFe96R1eoi_-5w?view">agenda</a></p>



<a name="195843818"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843818" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843818">(Apr 30 2020 at 14:08)</a>:</h4>
<p>I'd just like to call attention again to the "Implement LLVM-compatible source-based code coverage" MCP. It's currently in need of feedback about the approach and someone familiar with the frontend of the compiler to second it.</p>



<a name="195843846"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843846" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843846">(Apr 30 2020 at 14:08)</a>:</h4>
<p>Thanks <span class="user-mention" data-user-id="125250">@Wesley Wiser</span></p>



<a name="195843877"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843877" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843877">(Apr 30 2020 at 14:09)</a>:</h4>
<p>cc <span class="user-mention" data-user-id="123856">@Vadim Petrochenkov</span> ^</p>



<a name="195843942"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843942" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843942">(Apr 30 2020 at 14:09)</a>:</h4>
<p>okay, so, for <a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=label%3Abeta-nominated+label%3AT-compiler">T-compiler beta-noms</a>, we have four on the agenda</p>



<a name="195843962"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195843962" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195843962">(Apr 30 2020 at 14:09)</a>:</h4>
<p>beta-nom 1/4: "Quick and dirty fix of the unused_braces lint" <a href="https://github.com/rust-lang/rust/pull/71517" title="https://github.com/rust-lang/rust/pull/71517">#71517</a></p>



<a name="195844159"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844159" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844159">(Apr 30 2020 at 14:11)</a>:</h4>
<p>/me was worried by the "dirty" in the title</p>



<a name="195844195"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844195" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844195">(Apr 30 2020 at 14:11)</a>:</h4>
<p>but this doesn't seem <em>that</em> bad; at least, I won't block a backport on it...</p>



<a name="195844316"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844316" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844316">(Apr 30 2020 at 14:12)</a>:</h4>
<p>T-rustdoc is very under-resourced right now, right?</p>



<a name="195844363"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844363" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844363">(Apr 30 2020 at 14:12)</a>:</h4>
<p>as in, we probably shouldn't expect a fix for this in rustdoc anytime soon?</p>



<a name="195844383"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844383" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844383">(Apr 30 2020 at 14:12)</a>:</h4>
<p>Yes, I believe so.</p>



<a name="195844384"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844384" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844384">(Apr 30 2020 at 14:12)</a>:</h4>
<p>anyway, beta approved</p>



<a name="195844425"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844425" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844425">(Apr 30 2020 at 14:12)</a>:</h4>
<p>beta-nom 2/4: "normalize field projection ty to fix broken MIR issue" <a href="https://github.com/rust-lang/rust/pull/71488" title="https://github.com/rust-lang/rust/pull/71488">#71488</a></p>



<a name="195844541"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844541" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844541">(Apr 30 2020 at 14:13)</a>:</h4>
<p>yeah seems fine</p>



<a name="195844611"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844611" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844611">(Apr 30 2020 at 14:14)</a>:</h4>
<p>beta-approved</p>



<a name="195844647"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844647" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844647">(Apr 30 2020 at 14:14)</a>:</h4>
<p>beta-nom 3/4: "fix error code in E0751.md" <a href="https://github.com/rust-lang/rust/pull/71426" title="https://github.com/rust-lang/rust/pull/71426">#71426</a></p>



<a name="195844751"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844751" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844751">(Apr 30 2020 at 14:15)</a>:</h4>
<p>so, this does seem very low-risk</p>



<a name="195844769"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844769" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844769">(Apr 30 2020 at 14:15)</a>:</h4>
<p>but ... is it high priority?</p>



<a name="195844805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844805">(Apr 30 2020 at 14:15)</a>:</h4>
<p><span class="user-mention" data-user-id="119031">@Esteban Küber</span> nominated, maybe they can explain?</p>



<a name="195844923"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844923" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844923">(Apr 30 2020 at 14:16)</a>:</h4>
<p>I guess it's just that it gives the .. wrong  error code?</p>



<a name="195844931"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844931" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844931">(Apr 30 2020 at 14:16)</a>:</h4>
<p>I cannot tell based on the issues when this was injected</p>



<a name="195844958"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844958" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844958">(Apr 30 2020 at 14:16)</a>:</h4>
<p>it was my PR that added negative impls</p>



<a name="195844961"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844961" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844961">(Apr 30 2020 at 14:16)</a>:</h4>
<p>but</p>



<a name="195844972"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844972" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844972">(Apr 30 2020 at 14:16)</a>:</h4>
<p>if this was truly injected so recently that its only on the beta</p>



<a name="195844979"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844979" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844979">(Apr 30 2020 at 14:16)</a>:</h4>
<p>negative impls are unstable and can only be used on nightly etc</p>



<a name="195844996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195844996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195844996">(Apr 30 2020 at 14:16)</a>:</h4>
<p>I'd say it's low priority and not worth backporting</p>



<a name="195845026"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845026" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845026">(Apr 30 2020 at 14:16)</a>:</h4>
<p>i.e., this error can only arise when building libstd more or less :P</p>



<a name="195845045"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845045" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845045">(Apr 30 2020 at 14:16)</a>:</h4>
<p>ok, that's not true, but it does require nightly builds</p>



<a name="195845048"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845048" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845048">(Apr 30 2020 at 14:17)</a>:</h4>
<p>okay, lets decline and let <span class="user-mention" data-user-id="119031">@Esteban Küber</span> argue for the opposition if they so choose</p>



<a name="195845136"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845136" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845136">(Apr 30 2020 at 14:17)</a>:</h4>
<p>beta-nom 4/4: "Remove some <code>Vec</code> allocations to improve performance" <a href="https://github.com/rust-lang/rust/pull/71268" title="https://github.com/rust-lang/rust/pull/71268">#71268</a></p>



<a name="195845258"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845258" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845258">(Apr 30 2020 at 14:18)</a>:</h4>
<p>/me has realization: if we get a bot to start spitting out the titles above, then <span class="user-mention" data-user-id="116083">@pnkfelix</span> will get to start voting for themself!</p>



<a name="195845400"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845400" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845400">(Apr 30 2020 at 14:19)</a>:</h4>
<p>ooh, nice</p>



<a name="195845408"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845408" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845408">(Apr 30 2020 at 14:19)</a>:</h4>
<p>can anyone give me a summary of how much performance PR <a href="https://github.com/rust-lang/rust/issues/71268" title="https://github.com/rust-lang/rust/issues/71268">#71268</a> wins back?</p>



<a name="195845448"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845448" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845448">(Apr 30 2020 at 14:19)</a>:</h4>
<div class="codehilite"><pre><span></span><code>wf-projection-stress-65510-che...
    avg: -7.8%  min: -11.7% max: -0.4%
wf-projection-stress-65510-deb...
    avg: -7.7%  min: -11.7% max: -0.4%
wf-projection-stress-65510-opt
    avg: -7.7%  min: -11.6% max: -0.4%
futures-check
    avg: -3.5%  min: -7.0%  max: -0.5%
futures-debug
    avg: -2.6%  min: -5.1%  max: -0.4%
serde-check
    avg: -3.1%  min: -4.6%  max: -0.4%
serde-debug
    avg: -2.8%  min: -4.2%  max: -0.4%
tokio-webpush-simple-check
    avg: -1.6%  min: -4.2%  max: -0.1%
serde-opt
    avg: -2.7%  min: -4.0%  max: -0.4%
futures-opt
    avg: -2.0%  min: -3.8%  max: -0.4%
cargo-check
    avg: -0.9%  min: -1.9%  max: -0.0%
</code></pre></div>



<a name="195845541"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845541" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845541">(Apr 30 2020 at 14:20)</a>:</h4>
<p><a href="https://perf.rust-lang.org/compare.html?start=8ce3f840ae9b735a66531996c32330f24b877cb0&amp;end=56be31fea40c74872156aabb1bcf41a5f55e0fd4" title="https://perf.rust-lang.org/compare.html?start=8ce3f840ae9b735a66531996c32330f24b877cb0&amp;end=56be31fea40c74872156aabb1bcf41a5f55e0fd4">https://perf.rust-lang.org/compare.html?start=8ce3f840ae9b735a66531996c32330f24b877cb0&amp;end=56be31fea40c74872156aabb1bcf41a5f55e0fd4</a></p>



<a name="195845550"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845550" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845550">(Apr 30 2020 at 14:20)</a>:</h4>
<p>thx</p>



<a name="195845574"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845574" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845574">(Apr 30 2020 at 14:20)</a>:</h4>
<p>seems pretty harmless</p>



<a name="195845590"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845590" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845590">(Apr 30 2020 at 14:20)</a>:</h4>
<p>not sure how <em>imp't</em> it is though</p>



<a name="195845640"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845640" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845640">(Apr 30 2020 at 14:20)</a>:</h4>
<p>yeah okay. I am always a little hestitant about backporting performance improvements</p>



<a name="195845651"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845651" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845651">(Apr 30 2020 at 14:20)</a>:</h4>
<p>unless they are truly no-brainers</p>



<a name="195845652"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845652" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845652">(Apr 30 2020 at 14:20)</a>:</h4>
<p>wf-projection-stress-65510 tries to mimic a real-world codebase, so I think there are places where this will matter</p>



<a name="195845674"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845674" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845674">(Apr 30 2020 at 14:21)</a>:</h4>
<p>well, it's fixing a regression</p>



<a name="195845704"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845704" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845704">(Apr 30 2020 at 14:21)</a>:</h4>
<p>yeah but performance regressions are ...</p>



<a name="195845727"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845727" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845727">(Apr 30 2020 at 14:21)</a>:</h4>
<p>... not binary states...</p>



<a name="195845817"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845817" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845817">(Apr 30 2020 at 14:22)</a>:</h4>
<p>anyway its fine, lets backport</p>



<a name="195845830"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845830" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845830">(Apr 30 2020 at 14:22)</a>:</h4>
<p>beta approved</p>



<a name="195845866"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845866" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845866">(Apr 30 2020 at 14:22)</a>:</h4>
<p>It only missed the train because of timing issues even after approval</p>



<a name="195845891"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845891" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845891">(Apr 30 2020 at 14:22)</a>:</h4>
<p>fair enough</p>



<a name="195845897"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845897" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845897">(Apr 30 2020 at 14:22)</a>:</h4>
<p>so, as I mentioned above</p>



<a name="195845915"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845915" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845915">(Apr 30 2020 at 14:22)</a>:</h4>
<p>this week we have some T-libs beta nominations to look at too</p>



<a name="195845919"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195845919" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195845919">(Apr 30 2020 at 14:22)</a>:</h4>
<p>And ameliorates a big timing regression <span aria-label="blush" class="emoji emoji-1f60a" role="img" title="blush">:blush:</span></p>



<a name="195846014"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846014" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846014">(Apr 30 2020 at 14:23)</a>:</h4>
<p>(there was a separate discussion about whether we can asynchronously handle low-risk beta-backport nominations; we'll hopefully talk more about that next week.)</p>



<a name="195846016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846016">(Apr 30 2020 at 14:23)</a>:</h4>
<p>Btw, re the doc backport, I proposed it to avoid the wrong documentation ending up in the public facing website.</p>



<a name="195846082"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846082" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846082">(Apr 30 2020 at 14:23)</a>:</h4>
<p>T-libs beta-nom 1/1: "Update stdarch submodule" <a href="https://github.com/rust-lang/rust/pull/71495" title="https://github.com/rust-lang/rust/pull/71495">#71495</a></p>



<a name="195846236"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846236" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846236">(Apr 30 2020 at 14:24)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846014" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846014">said</a>:</p>
<blockquote>
<p>(there was a separate discussion about whether we can asynchronously handle low-risk beta-backport nominations; we'll hopefully talk more about that next week.)</p>
</blockquote>
<p>aforementioned conversion: <a href="#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/t-libs.20issues.20in.20the.20meeting.20agenda.3F/near/195839368" title="#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/t-libs.20issues.20in.20the.20meeting.20agenda.3F/near/195839368">https://rust-lang.zulipchat.com/#narrow/stream/227806-t-compiler.2Fwg-prioritization/topic/t-libs.20issues.20in.20the.20meeting.20agenda.3F/near/195839368</a></p>



<a name="195846240"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846240" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846240">(Apr 30 2020 at 14:24)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119031">Esteban Küber</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846016" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846016">said</a>:</p>
<blockquote>
<p>Btw, re the doc backport, I proposed it to avoid the wrong documentation ending up in the public facing website.</p>
</blockquote>
<p>ah, interesting</p>



<a name="195846333"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846333" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846333">(Apr 30 2020 at 14:25)</a>:</h4>
<p>so, regarding PR <a href="https://github.com/rust-lang/rust/issues/71495" title="https://github.com/rust-lang/rust/issues/71495">#71495</a></p>



<a name="195846358"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846358" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846358">(Apr 30 2020 at 14:25)</a>:</h4>
<p>I think <span class="user-mention" data-user-id="116122">@simulacrum</span> has separately noted that it is low-risk</p>



<a name="195846381"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846381" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846381">(Apr 30 2020 at 14:25)</a>:</h4>
<p>yeah, well, it's a regression fix</p>



<a name="195846405"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846405" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846405">(Apr 30 2020 at 14:25)</a>:</h4>
<p>(though that regression has hit stable)</p>



<a name="195846471"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846471" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846471">(Apr 30 2020 at 14:26)</a>:</h4>
<p>right, I was reviewing the state of that bug</p>



<a name="195846491"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846491" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846491">(Apr 30 2020 at 14:26)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/71473" title="https://github.com/rust-lang/rust/issues/71473">#71473</a> i think</p>



<a name="195846522"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846522" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846522">(Apr 30 2020 at 14:26)</a>:</h4>
<p>which has been noted as dupe of <a href="https://github.com/rust-lang/rust/issues/68905" title="https://github.com/rust-lang/rust/issues/68905">#68905</a></p>



<a name="195846528"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846528" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846528">(Apr 30 2020 at 14:26)</a>:</h4>
<p>but generally I'd say that the fix is pretty minimal and fixes a regression -- seems like a good candidate</p>



<a name="195846539"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846539" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846539">(Apr 30 2020 at 14:26)</a>:</h4>
<p>I don't know how to judge the stdarch but I'd be ok doing it</p>



<a name="195846594"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846594" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846594">(Apr 30 2020 at 14:27)</a>:</h4>
<p>oh, I guess can click through to see the diffs</p>



<a name="195846603"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846603" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846603">(Apr 30 2020 at 14:27)</a>:</h4>
<p>does PR <a href="https://github.com/rust-lang/rust/issues/71495" title="https://github.com/rust-lang/rust/issues/71495">#71495</a> also fix <a href="https://github.com/rust-lang/rust/issues/68905" title="https://github.com/rust-lang/rust/issues/68905">#68905</a> ?</p>



<a name="195846648"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846648" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846648">(Apr 30 2020 at 14:27)</a>:</h4>
<p>or that was already fixed</p>



<a name="195846658"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846658" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846658">(Apr 30 2020 at 14:27)</a>:</h4>
<p>It's claimed to <a href="https://github.com/rust-lang/rust/issues/68905#issuecomment-601385193" title="https://github.com/rust-lang/rust/issues/68905#issuecomment-601385193">https://github.com/rust-lang/rust/issues/68905#issuecomment-601385193</a></p>



<a name="195846661"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846661" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846661">(Apr 30 2020 at 14:27)</a>:</h4>
<p>and this was remaining/overlooked work?</p>



<a name="195846691"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846691" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846691">(Apr 30 2020 at 14:27)</a>:</h4>
<p>yeah overlooked</p>



<a name="195846800"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846800" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846800">(Apr 30 2020 at 14:28)</a>:</h4>
<p>crater didn't catch it because the crate in question didn't compile anyway (assembler errors, iirc) and a more minimal stabilization was considered sufficient</p>



<a name="195846823"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846823" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846823">(Apr 30 2020 at 14:28)</a>:</h4>
<p>well, no one argued strongly for more</p>



<a name="195846848"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846848" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846848">(Apr 30 2020 at 14:28)</a>:</h4>
<p>Ugh laptop died</p>



<a name="195846903"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195846903" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195846903">(Apr 30 2020 at 14:29)</a>:</h4>
<p>Um okay let’s say beta approved then</p>



<a name="195847101"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847101" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847101">(Apr 30 2020 at 14:30)</a>:</h4>
<p>Sorry I’m trying to bring up agenda on spare laptop now</p>



<a name="195847244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847244">(Apr 30 2020 at 14:31)</a>:</h4>
<p>let me help you a bit</p>



<a name="195847246"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847246" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847246">(Apr 30 2020 at 14:31)</a>:</h4>
<p>handing off to <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span></p>



<a name="195847275"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847275" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847275">(Apr 30 2020 at 14:31)</a>:</h4>
<p>so next is ....</p>



<a name="195847279"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847279" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847279">(Apr 30 2020 at 14:31)</a>:</h4>
<h2>Stable-nominations</h2>



<a name="195847314"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847314" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847314">(Apr 30 2020 at 14:31)</a>:</h4>
<p>we don't have stable nominations for <code>T-compiler</code></p>



<a name="195847375"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847375" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847375">(Apr 30 2020 at 14:32)</a>:</h4>
<p>but we do have two for <code>T-libs</code></p>



<a name="195847456"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847456" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847456">(Apr 30 2020 at 14:32)</a>:</h4>
<p>T-libs stable-nom 1/2: " "Update stdarch submodule" <a href="https://github.com/rust-lang/rust/pull/71495" title="https://github.com/rust-lang/rust/pull/71495">#71495</a> <span aria-label="back" class="emoji emoji-1f519" role="img" title="back">:back:</span> / <span aria-label="hand" class="emoji emoji-270b" role="img" title="hand">:hand:</span></p>



<a name="195847478"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847478" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847478">(Apr 30 2020 at 14:32)</a>:</h4>
<p>well that one was also stable nominated</p>



<a name="195847524"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847524" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847524">(Apr 30 2020 at 14:33)</a>:</h4>
<p>Right we just approved it for beta</p>



<a name="195847552"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847552" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847552">(Apr 30 2020 at 14:33)</a>:</h4>
<p>should it be approved for stable too?</p>



<a name="195847563"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847563" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847563">(Apr 30 2020 at 14:33)</a>:</h4>
<p>I suspect it is fine for stable too. Any objections?</p>



<a name="195847779"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847779" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847779">(Apr 30 2020 at 14:34)</a>:</h4>
<p>ok, seems like this one is stable accepted</p>



<a name="195847825"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847825" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847825">(Apr 30 2020 at 14:35)</a>:</h4>
<p>okay I rebooted</p>



<a name="195847828"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847828" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847828">(Apr 30 2020 at 14:35)</a>:</h4>
<p>bear with me because can see now how hard is Felix job here :)</p>



<a name="195847858"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847858" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847858">(Apr 30 2020 at 14:35)</a>:</h4>
<p>T-libs stable-nom 2/2: - "avx512 support regression in 1.43" <a href="https://github.com/rust-lang/rust/issues/71473" title="https://github.com/rust-lang/rust/issues/71473">#71473</a> <span aria-label="back" class="emoji emoji-1f519" role="img" title="back">:back:</span> / <span aria-label="hand" class="emoji emoji-270b" role="img" title="hand">:hand:</span></p>



<a name="195847888"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847888" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847888">(Apr 30 2020 at 14:35)</a>:</h4>
<p>handing back to you <span class="user-mention" data-user-id="116083">@pnkfelix</span> ... pheww :)</p>



<a name="195847998"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195847998" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195847998">(Apr 30 2020 at 14:36)</a>:</h4>
<p>wait, <a href="https://github.com/rust-lang/rust/issues/71473" title="https://github.com/rust-lang/rust/issues/71473">#71473</a> is an issue</p>



<a name="195848006"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848006" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848006">(Apr 30 2020 at 14:36)</a>:</h4>
<p>wait</p>



<a name="195848008"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848008" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848008">(Apr 30 2020 at 14:36)</a>:</h4>
<p>yeah</p>



<a name="195848009"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848009" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848009">(Apr 30 2020 at 14:36)</a>:</h4>
<p>I'm confused. What are we voting on? <a href="https://github.com/rust-lang/rust/issues/71473" title="https://github.com/rust-lang/rust/issues/71473">#71473</a> is an issue</p>



<a name="195848028"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848028" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848028">(Apr 30 2020 at 14:36)</a>:</h4>
<p>okay this was a hiccup</p>



<a name="195848140"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848140" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848140">(Apr 30 2020 at 14:37)</a>:</h4>
<p>but yeah</p>



<a name="195848153"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848153" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848153">(Apr 30 2020 at 14:37)</a>:</h4>
<p>I think this was <a href="https://github.com/rust-lang/rust/issues/71473#event-3266310215" title="https://github.com/rust-lang/rust/issues/71473#event-3266310215">nominated</a> just to get discussion from T-libs which happened last week.</p>



<a name="195848159"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848159" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848159">(Apr 30 2020 at 14:37)</a>:</h4>
<p>we essentially just finished apprvoing this</p>



<a name="195848163"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848163" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848163">(Apr 30 2020 at 14:37)</a>:</h4>
<p>And was never un-nominated</p>



<a name="195848203"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848203" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848203">(Apr 30 2020 at 14:38)</a>:</h4>
<p>right, its possible that the stable-nominationed tag was added erroneously, or perhaps to get attention of T-libs, not sure</p>



<a name="195848272"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848272" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848272">(Apr 30 2020 at 14:38)</a>:</h4>
<p>in either case, we do not need to worry about approving this a second time</p>



<a name="195848293"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848293" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848293">(Apr 30 2020 at 14:38)</a>:</h4>
<p>okay, moving on</p>



<a name="195848315"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848315" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848315">(Apr 30 2020 at 14:38)</a>:</h4>
<h2>PR's S-waiting-on-team</h2>
<p><a href="https://github.com/rust-lang/rust/pulls?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3AS-waiting-on-team+label%3AT-compiler+" title="https://github.com/rust-lang/rust/pulls?utf8=%E2%9C%93&amp;q=is%3Aopen+label%3AS-waiting-on-team+label%3AT-compiler+">T-compiler S-waiting-on-team</a></p>
<ul>
<li>"Add Option to Force Unwind Tables" <a href="https://github.com/rust-lang/rust/pull/69984" title="https://github.com/rust-lang/rust/pull/69984">#69984</a><ul>
<li>FCP finished, disposition to merge.</li>
</ul>
</li>
</ul>



<a name="195848336"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848336" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848336">(Apr 30 2020 at 14:38)</a>:</h4>
<p>i.e. that's more of a general notice</p>



<a name="195848544"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848544" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848544">(Apr 30 2020 at 14:40)</a>:</h4>
<p>that that PR is on track to be merged, assuming it gets an r+ (<span class="user-mention" data-user-id="123586">@nagisa</span> am I right in assuming that you, or perhaps <span class="user-mention" data-user-id="124289">@Hanna Kruppe</span> , are going to take care of any further review and the r+?)</p>



<a name="195848594"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848594" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848594">(Apr 30 2020 at 14:40)</a>:</h4>
<p>next up</p>



<a name="195848597"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848597" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848597">(Apr 30 2020 at 14:40)</a>:</h4>
<h2>Issues of Note</h2>



<a name="195848629"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848629" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848629">(Apr 30 2020 at 14:40)</a>:</h4>
<h3>Short Summary</h3>
<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+">2 P-critical issues</a> (one more than last week)<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+no%3Aassignee" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-critical+no%3Aassignee">both are unassigned</a> (one more than last week)</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+">42 P-high issues</a> (one less than last week)<ul>
<li><a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+no%3Aassignee">21 of those are unassigned</a> (one less than last week)</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-beta">1 P-high, 2 P-medium, 1 P-low, 1 T-libs regression-from-stable-to-beta</a><ul>
<li>The only assigned is the P-high one.</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-nightly">2 P-high, 3 P-medium, 2 P-low regression-from-stable-to-nightly</a><ul>
<li>Both P-high are assigned and one P-low is assigned too.</li>
</ul>
</li>
<li><a href="https://github.com/rust-lang/rust/labels/regression-from-stable-to-stable" title="https://github.com/rust-lang/rust/labels/regression-from-stable-to-stable">71 regression-from-stable-to-stable</a><ul>
<li><a href="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3Aregression-from-stable-to-stable+-label%3AP-critical+-label%3AP-high+-label%3AP-medium+-label%3AP-low" title="https://github.com/rust-lang/rust/issues?q=is%3Aopen+label%3Aregression-from-stable-to-stable+-label%3AP-critical+-label%3AP-high+-label%3AP-medium+-label%3AP-low">25 of those are not prioritized</a>.</li>
</ul>
</li>
</ul>
<p>There are 1 more <code>P-critical</code> issue and 1 less <code>P-high</code> issues in comparison with last week.</p>



<a name="195848729"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848729" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848729">(Apr 30 2020 at 14:41)</a>:</h4>
<p>wow two critical unassigned bugs</p>



<a name="195848750"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848750" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848750">(Apr 30 2020 at 14:41)</a>:</h4>
<p>So <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> and I were talking about him possibly fixing <a href="https://github.com/rust-lang/rust/issues/71550" title="https://github.com/rust-lang/rust/issues/71550">#71550</a> (a P-critical issue)</p>



<a name="195848790"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848790" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848790">(Apr 30 2020 at 14:41)</a>:</h4>
<p>I was going to mention <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> that if you want I could do a bit of digging with you later today</p>



<a name="195848805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848805">(Apr 30 2020 at 14:41)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195848729" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195848729">said</a>:</p>
<blockquote>
<p>wow two critical unassigned bugs</p>
</blockquote>
<p>good news is that we've just released so we have time :)</p>



<a name="195848868"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848868" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848868">(Apr 30 2020 at 14:42)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116009">nikomatsakis</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195848790" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195848790">said</a>:</p>
<blockquote>
<p>I was going to mention <span class="user-mention silent" data-user-id="116266">Santiago Pastorino</span> that if you want I could do a bit of digging with you later today</p>
</blockquote>
<p><span aria-label="+1" class="emoji emoji-1f44d" role="img" title="+1">:+1:</span>, let's assign that one to me</p>



<a name="195848909"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848909" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848909">(Apr 30 2020 at 14:42)</a>:</h4>
<p>assigned to me</p>



<a name="195848913"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848913" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848913">(Apr 30 2020 at 14:42)</a>:</h4>
<p>is <a href="https://github.com/rust-lang/rust/issues/71504" title="https://github.com/rust-lang/rust/issues/71504">#71504</a> actually critical?</p>



<a name="195848931"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848931" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848931">(Apr 30 2020 at 14:42)</a>:</h4>
<blockquote>
<p>rust-analyser segfault with lto=thin, linker=lld-link <a href="https://github.com/rust-lang/rust/issues/71504" title="https://github.com/rust-lang/rust/issues/71504">#71504</a></p>
</blockquote>



<a name="195848958"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848958" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848958">(Apr 30 2020 at 14:42)</a>:</h4>
<p>ah, it's a segfault <em>compiling</em> rust-analyzer</p>



<a name="195848978"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848978" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848978">(Apr 30 2020 at 14:42)</a>:</h4>
<p>yeah that was the pointer to P-critical</p>



<a name="195848990"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195848990" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195848990">(Apr 30 2020 at 14:43)</a>:</h4>
<p>but the segfault is from running lld itself?</p>



<a name="195849013"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849013" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849013">(Apr 30 2020 at 14:43)</a>:</h4>
<p>I don't know if we can do anything about that, if that's the case</p>



<a name="195849027"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849027" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849027">(Apr 30 2020 at 14:43)</a>:</h4>
<p>rust-analyzer segfaulting but we discussed if it wasn't P-high, good to discuss with everyone now too :)</p>



<a name="195849031"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849031" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849031">(Apr 30 2020 at 14:43)</a>:</h4>
<p>No, the backtrace seems to be from running the result</p>



<a name="195849034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849034">(Apr 30 2020 at 14:43)</a>:</h4>
<blockquote>
<p>So this is an lld (LLVM 10) bug, the first I encounter. So I guess this is out of rust-lang scope.</p>
</blockquote>



<a name="195849043"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849043" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849043">(Apr 30 2020 at 14:43)</a>:</h4>
<p>/me looks again</p>



<a name="195849153"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849153" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849153">(Apr 30 2020 at 14:44)</a>:</h4>
<p>I'm not sure I'd call it P-crticial, but it's .. complicated. e.g., <span class="user-mention" data-user-id="211727">@Jonas Schievink</span> <a href="https://github.com/rust-lang/rust/issues/71504#issuecomment-620503852" title="https://github.com/rust-lang/rust/issues/71504#issuecomment-620503852">wrote</a>:</p>
<blockquote>
<p>Yes, embedded ARM targets use \[lld] by default. They're ELF targets though, and LLD's ELF backend is fairly reliable (I've only witnessed it corrupting debuginfo once, not cause crashes like this).</p>
</blockquote>



<a name="195849271"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849271" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849271">(Apr 30 2020 at 14:45)</a>:</h4>
<p>it'd be nice to at least report it upstream, if it's truly an lld bug</p>



<a name="195849293"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849293" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849293">(Apr 30 2020 at 14:45)</a>:</h4>
<p>so we have two questions to address: 1. is this within our scope to address, and 2. if so, is it critical, or merely P-high (perhaps)</p>



<a name="195849317"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849317" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849317">(Apr 30 2020 at 14:45)</a>:</h4>
<p>LLVM ice breakers have already been pinged on it</p>



<a name="195849362"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849362" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849362">(Apr 30 2020 at 14:45)</a>:</h4>
<p>I think it also needs the <code>I-unsound</code> label re-applied. I'm not sure how this situation is different than other LLVM related unsoundness issues.</p>



<a name="195849364"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849364" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849364">(Apr 30 2020 at 14:45)</a>:</h4>
<p>I guess given the latest comments seems more like <code>P-high</code> than <code>P-critical</code></p>



<a name="195849372"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849372" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849372">(Apr 30 2020 at 14:46)</a>:</h4>
<p>I guess we need to reduce it further to properly evaluate the answers to my two questions</p>



<a name="195849486"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849486" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849486">(Apr 30 2020 at 14:46)</a>:</h4>
<p>lets downgrade to P-high (unless someone here wants to argue for P-critical)</p>



<a name="195849537"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849537" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849537">(Apr 30 2020 at 14:47)</a>:</h4>
<p>and other than that, yeah, it may need <code>I-unsound explosion-icon</code> readded</p>



<a name="195849561"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849561" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849561">(Apr 30 2020 at 14:47)</a>:</h4>
<p>seems right</p>



<a name="195849589"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849589" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849589">(Apr 30 2020 at 14:47)</a>:</h4>
<p>/me wonders if they would be able to get away with renaming that back to <code>I-unsound</code></p>



<a name="195849732"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849732" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849732">(Apr 30 2020 at 14:48)</a>:</h4>
<p>I'd not mind :)</p>
<p>I think segfaults are presumably not unsound?</p>



<a name="195849737"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849737" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849737">(Apr 30 2020 at 14:48)</a>:</h4>
<p>if they're at link time</p>



<a name="195849747"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849747" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849747">(Apr 30 2020 at 14:48)</a>:</h4>
<p>though I'm still not clear on that</p>



<a name="195849754"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849754" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849754">(Apr 30 2020 at 14:48)</a>:</h4>
<p>you mean if they are a result of linker error?</p>



<a name="195849778"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849778" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849778">(Apr 30 2020 at 14:49)</a>:</h4>
<p>the segfault, it seems, is not at link time; I was incorrect about that, according to the posted back trace</p>



<a name="195849805"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849805" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849805">(Apr 30 2020 at 14:49)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/71504#issuecomment-618941146" title="https://github.com/rust-lang/rust/issues/71504#issuecomment-618941146">This comment</a> suggests the segfault happens at run time.</p>



<a name="195849841"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849841" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849841">(Apr 30 2020 at 14:49)</a>:</h4>
<p>hm, so one other thing to check - potentially, IIRC, thin LTO means that the linker is running that LTO</p>



<a name="195849873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849873">(Apr 30 2020 at 14:49)</a>:</h4>
<p>however if LLVM we used to generate the bitcode and the linker's LLVM are different, well, that could presumably be a problem</p>



<a name="195849886"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849886" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849886">(Apr 30 2020 at 14:49)</a>:</h4>
<p>oh interesting</p>



<a name="195849953"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195849953" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195849953">(Apr 30 2020 at 14:50)</a>:</h4>
<p>maybe I will try to look into this later, but that may be tricky if this only reproduces on Windows</p>



<a name="195850030"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850030" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850030">(Apr 30 2020 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="125250">@Wesley Wiser</span> you use Windows, right? Do you have spare cycles to check if this at least reproduces for you locally?</p>



<a name="195850060"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850060" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850060">(Apr 30 2020 at 14:51)</a>:</h4>
<p>anyway</p>



<a name="195850068"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850068" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> tmandry <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850068">(Apr 30 2020 at 14:51)</a>:</h4>
<p>fyi, we use lld on fuchsia with LLVM version skew like that, and haven't encountered problems like the one <span class="user-mention" data-user-id="116122">@simulacrum</span> mentions</p>



<a name="195850074"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850074" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850074">(Apr 30 2020 at 14:51)</a>:</h4>
<p>Oof that's what happens when you volunteer <span aria-label="laughing" class="emoji emoji-1f606" role="img" title="laughing">:laughing:</span></p>



<a name="195850092"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850092" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850092">(Apr 30 2020 at 14:51)</a>:</h4>
<p>Yeah, I can definitely try to repro it <span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span></p>



<a name="195850141"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850141" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850141">(Apr 30 2020 at 14:51)</a>:</h4>
<p><span class="user-mention" data-user-id="125250">@Wesley Wiser</span> its no problem if you can't spare the time (as a human or of your machine)</p>



<a name="195850145"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850145" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850145">(Apr 30 2020 at 14:51)</a>:</h4>
<p><span class="user-mention" data-user-id="116883">@tmandry</span> hm, interesting. it might also be dependent on something else -- I don't really know how stable etc llvm's bitcode is wrt to thinlto</p>



<a name="195850225"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850225" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850225">(Apr 30 2020 at 14:52)</a>:</h4>
<p>No, I've got time. Just joking.</p>



<a name="195850230"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850230" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850230">(Apr 30 2020 at 14:52)</a>:</h4>
<p>we really do need to make an ICE-breakers Window-breakers</p>



<a name="195850251"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850251" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850251">(Apr 30 2020 at 14:52)</a>:</h4>
<p>anyway</p>



<a name="195850266"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850266" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850266">(Apr 30 2020 at 14:52)</a>:</h4>
<p>just a few more things</p>



<a name="195850273"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850273" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850273">(Apr 30 2020 at 14:52)</a>:</h4>
<p>two nominated issues</p>



<a name="195850285"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850285" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850285">(Apr 30 2020 at 14:52)</a>:</h4>
<p>we already touched on <a href="https://github.com/rust-lang/rust/issues/71550" title="https://github.com/rust-lang/rust/issues/71550">#71550</a></p>



<a name="195850286"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850286" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850286">(Apr 30 2020 at 14:52)</a>:</h4>
<p>/me idly wonders if you can run lld-link on Linux...</p>



<a name="195850326"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850326" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850326">(Apr 30 2020 at 14:52)</a>:</h4>
<p>(and I guess <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> is going to be looking at <a href="https://github.com/rust-lang/rust/issues/71550" title="https://github.com/rust-lang/rust/issues/71550">#71550</a> later today)</p>



<a name="195850353"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850353" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850353">(Apr 30 2020 at 14:53)</a>:</h4>
<p>and the other nominated issue <strong>was</strong> (emphasis) <a href="https://github.com/rust-lang/rust/issues/71416" title="https://github.com/rust-lang/rust/issues/71416">#71416</a></p>



<a name="195850391"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850391" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850391">(Apr 30 2020 at 14:53)</a>:</h4>
<p>but I forked off some fresh issues for that</p>



<a name="195850454"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850454" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850454">(Apr 30 2020 at 14:53)</a>:</h4>
<p>I've assigned those to myself as follow up of the original issue</p>



<a name="195850487"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850487" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850487">(Apr 30 2020 at 14:53)</a>:</h4>
<p>I did want to check though: <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> and I tentatively decided to make "Dynamically select alignment of a <code>dyn Trait</code> local value" <a href="https://github.com/rust-lang/rust/issues/71695" title="https://github.com/rust-lang/rust/issues/71695">#71695</a> a P-medium ticket</p>



<a name="195850491"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850491" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850491">(Apr 30 2020 at 14:53)</a>:</h4>
<p>if someone really wants to jump there or something feel free :)</p>



<a name="195850577"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850577" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850577">(Apr 30 2020 at 14:54)</a>:</h4>
<p>and I was curious if anyone had feedback on how high priority it might be to finish implementing that feature</p>



<a name="195850582"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850582" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850582">(Apr 30 2020 at 14:54)</a>:</h4>
<p>(like, correctly)</p>



<a name="195850621"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850621" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850621">(Apr 30 2020 at 14:54)</a>:</h4>
<p>but you don't have to provide such feedback synchronously</p>



<a name="195850641"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850641" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850641">(Apr 30 2020 at 14:55)</a>:</h4>
<p>feel free to post it on the issue or in a zulip topic</p>



<a name="195850648"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850648" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850648">(Apr 30 2020 at 14:55)</a>:</h4>
<p>finally</p>



<a name="195850656"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850656" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850656">(Apr 30 2020 at 14:55)</a>:</h4>
<p>WG checkins</p>



<a name="195850694"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850694" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850694">(Apr 30 2020 at 14:55)</a>:</h4>
<p>WG-Polymorphization by @davidtwco:</p>
<blockquote>
<p>I can't remember where the polymorphisation work was last time I gave an update at the meeting, so to remind everyone, the polymorphisation working group is for tracking my master's project - implementing an analysis that will detect when generic parameters are unused, and then reducing monomorphisation as a result.</p>
<p><a href="https://github.com/rust-lang/rust/issues/69749" title="https://github.com/rust-lang/rust/issues/69749">#69749</a> has a working implementation of polymorphisation (I've paused working on it until my exams are over), which we've run perf on and gotten mixed results - there are some interesting interactions with LTO on one benchmark configuration, and some cases see 3-5% improvements, but some are worse-off (normally by 1-2%). There's probably some room for improvement yet.</p>
</blockquote>



<a name="195850713"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850713" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850713">(Apr 30 2020 at 14:55)</a>:</h4>
<p>and</p>



<a name="195850724"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850724" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850724">(Apr 30 2020 at 14:55)</a>:</h4>
<p>WG-prioritization by @spastorino:</p>
<p>This is the first checkin from WG Prioritization.</p>
<ul>
<li><a href="https://rust-lang.github.io/compiler-team/working-groups/prioritization/" title="https://rust-lang.github.io/compiler-team/working-groups/prioritization/">The group is formally formed</a><ul>
<li>Main goal is to triaging bugs, mainly deciding if bugs are critical (potential release blockers) or not.</li>
<li>Route bugs to folks who can fix them.</li>
<li>Build the agenda for these meetings.</li>
<li>Among other things :)</li>
</ul>
</li>
<li>We have <a href="https://hackmd.io/P3yvagSSS7yAI2QxhLfPtQ?view" title="https://hackmd.io/P3yvagSSS7yAI2QxhLfPtQ?view">some plans</a> and <a href="https://hackmd.io/pHb6eTZ2Sjy6XZmwXZHIBA?view" title="https://hackmd.io/pHb6eTZ2Sjy6XZmwXZHIBA?view">procedures</a> documented.</li>
<li>We've created I-prioritize and splitted the meaning of it with I-nominated for easier request for prioritization.</li>
<li>We've created P-critical and defined the <a href="https://hackmd.io/7NRRbq62TnaezW7-n15cDw" title="https://hackmd.io/7NRRbq62TnaezW7-n15cDw">different priority levels</a> this is still WIP.</li>
<li>We're trying to have all this process async<ul>
<li>When someone tags <code>I-prioritize</code> a Zulip topic is automatically created requesting for prioritization of the issue in question so we can prioritize async.</li>
<li>@rustbot prioritize works too for non-members</li>
<li>We should do the same for beta/stable backports, I-nominated, S-waiting-on-team</li>
<li>We're also trying to automate with commands our meetings and this one in particular.</li>
</ul>
</li>
</ul>



<a name="195850841"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850841" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850841">(Apr 30 2020 at 14:56)</a>:</h4>
<p>oh right, gotta put asterisks around peoples names when you paste them into zulip, hmm...</p>



<a name="195850881"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850881" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850881">(Apr 30 2020 at 14:56)</a>:</h4>
<p>I would like to take this moment to raise the question of</p>



<a name="195850899"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850899" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850899">(Apr 30 2020 at 14:56)</a>:</h4>
<p>how to proceed with <span class="user-mention" data-user-id="116107">@davidtwco</span>'s work</p>



<a name="195850912"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850912" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850912">(Apr 30 2020 at 14:56)</a>:</h4>
<p>Personally I think we should land it</p>



<a name="195850923"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850923" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850923">(Apr 30 2020 at 14:56)</a>:</h4>
<p>But I'm not sure what we should do before landing it :)</p>



<a name="195850926"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850926" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850926">(Apr 30 2020 at 14:56)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850841" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850841">said</a>:</p>
<blockquote>
<p>oh right, gotta put asterisks around peoples names when you paste them into zulip, hmm...</p>
</blockquote>
<p><span aria-label="+1" class="emoji emoji-1f44d" role="img" title="+1">:+1:</span>, will add that to the template :)</p>



<a name="195850955"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850955" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850955">(Apr 30 2020 at 14:56)</a>:</h4>
<p>And I could <em>imagine</em> landing it behind an opt-level flag or something, if we think it's not there yet</p>



<a name="195850970"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850970" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850970">(Apr 30 2020 at 14:56)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116009">nikomatsakis</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850912" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850912">said</a>:</p>
<blockquote>
<p>Personally I think we should land it</p>
</blockquote>
<p>the main issue is that the performance "wins" are not what was expected</p>



<a name="195850978"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195850978" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195850978">(Apr 30 2020 at 14:56)</a>:</h4>
<p>right?</p>



<a name="195851000"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851000" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851000">(Apr 30 2020 at 14:57)</a>:</h4>
<p>Correct</p>



<a name="195851010"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851010" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851010">(Apr 30 2020 at 14:57)</a>:</h4>
<p>did we measure code size at all?</p>



<a name="195851013"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851013" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851013">(Apr 30 2020 at 14:57)</a>:</h4>
<p>I'm not 100% sure what was <em>expected</em></p>



<a name="195851016"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851016" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> simulacrum <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851016">(Apr 30 2020 at 14:57)</a>:</h4>
<p>compile time, that is, right?</p>



<a name="195851049"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851049" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851049">(Apr 30 2020 at 14:57)</a>:</h4>
<p>and also unoptimized builds</p>



<a name="195851052"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851052" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851052">(Apr 30 2020 at 14:57)</a>:</h4>
<p>but they're not overwhelming</p>



<a name="195851069"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851069" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851069">(Apr 30 2020 at 14:57)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119009">eddyb</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851010" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851010">said</a>:</p>
<blockquote>
<p>did we measure code size at all?</p>
</blockquote>
<p>I asked them to in my feedback on the thesis</p>



<a name="195851102"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851102" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851102">(Apr 30 2020 at 14:57)</a>:</h4>
<p>I don't know, but I think coming up with a list of measurements we'd like is a good idea</p>



<a name="195851108"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851108" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851108">(Apr 30 2020 at 14:57)</a>:</h4>
<p>but that was more of a warning "your committee might want this"</p>



<a name="195851130"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851130" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851130">(Apr 30 2020 at 14:57)</a>:</h4>
<p>all of the slowdowns appear to be (without further investigation) from LLVM being able to do more</p>



<a name="195851180"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851180" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851180">(Apr 30 2020 at 14:58)</a>:</h4>
<p>I could imagine having a design meeting to discuss this a bit</p>



<a name="195851203"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851203" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851203">(Apr 30 2020 at 14:58)</a>:</h4>
<p>(not on the rustc side)</p>



<a name="195851222"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851222" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851222">(Apr 30 2020 at 14:58)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119009">eddyb</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851130" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851130">said</a>:</p>
<blockquote>
<p>all of the slowdowns appear to be (without further investigation) from LLVM being able to do more</p>
</blockquote>
<p>as in, LLVM is producing better final code?</p>



<a name="195851237"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851237" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851237">(Apr 30 2020 at 14:58)</a>:</h4>
<p>and thus compilation is slower?</p>



<a name="195851247"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851247" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851247">(Apr 30 2020 at 14:58)</a>:</h4>
<p>unclear, but definitely spending more time on it</p>



<a name="195851252"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851252" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851252">(Apr 30 2020 at 14:58)</a>:</h4>
<p>and in particular I'd like to (ideally) motivate folks to do more follow-up work (or at least discuss what kind of follow-up work we might do)</p>



<a name="195851290"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851290" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851290">(Apr 30 2020 at 14:58)</a>:</h4>
<p>that's interesting, <span class="user-mention" data-user-id="119009">@eddyb</span></p>



<a name="195851318"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851318" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> tmandry <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851318">(Apr 30 2020 at 14:59)</a>:</h4>
<p>I suspect you would get some code size wins and that matters a lot in embedded use cases</p>



<a name="195851335"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851335" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851335">(Apr 30 2020 at 14:59)</a>:</h4>
<p>I think it sounds like we <em>definitely</em> do not want to throw this work away</p>



<a name="195851339"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851339" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851339">(Apr 30 2020 at 14:59)</a>:</h4>
<p>anyway I have to run in a bit but I do think we should, well, decide how to decide? then decide? not let it sit in limbo, in short</p>



<a name="195851354"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851354" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851354">(Apr 30 2020 at 14:59)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851335" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851335">said</a>:</p>
<blockquote>
<p>I think it sounds like we <em>definitely</em> do not want to throw this work away</p>
</blockquote>
<p>this too!</p>



<a name="195851365"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851365" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851365">(Apr 30 2020 at 14:59)</a>:</h4>
<p>is it worth a design meeting?</p>



<a name="195851368"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851368" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851368">(Apr 30 2020 at 14:59)</a>:</h4>
<p>One other thing the MIR Opt wg has seen is that changes to MIR can cause the cgu partitioning algorithm to put functions in different modules due to code size differences. That can have positive and negative effects on the incremental tests depending on whether or not you get lucky.</p>



<a name="195851378"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851378" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851378">(Apr 30 2020 at 14:59)</a>:</h4>
<p>which is my main point to why I think we should land it</p>



<a name="195851411"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851411" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851411">(Apr 30 2020 at 14:59)</a>:</h4>
<p>maybe not worth a design meeting, at least not <em>yet</em></p>



<a name="195851430"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851430" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851430">(Apr 30 2020 at 14:59)</a>:</h4>
<p><span class="user-mention" data-user-id="125250">@Wesley Wiser</span> I wonder how much the "mir opt" folks would want to follow-up on this work</p>



<a name="195851554"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851554" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851554">(Apr 30 2020 at 15:00)</a>:</h4>
<p>I think it definitely could be worth many design meetings, but it'd be good to clarify the goal thereof</p>



<a name="195851563"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851563" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851563">(Apr 30 2020 at 15:00)</a>:</h4>
<p>We just opened a <a href="https://github.com/rust-lang/compiler-team/issues/281" title="https://github.com/rust-lang/compiler-team/issues/281">compiler team planning meeting request</a> for that this morning :p</p>



<a name="195851570"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851570" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851570">(Apr 30 2020 at 15:00)</a>:</h4>
<p><span class="user-mention silent" data-user-id="125250">Wesley Wiser</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851368" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195851368">said</a>:</p>
<blockquote>
<p>One other thing the MIR Opt wg has seen is that changes to MIR can cause the cgu partitioning algorithm to put functions in different modules due to code size differences. That can have positive and negative effects on the incremental tests depending on whether or not you get lucky.</p>
</blockquote>
<p>I have wondered about this, and whether it is something we can/should try to make more predictable</p>



<a name="195851591"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851591" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851591">(Apr 30 2020 at 15:00)</a>:</h4>
<p>another interesting thing is that this barely scratches the surface, and there are some easy (and some harder due to lack of necessary infra in codegen) ways to remove even more monomorphizations</p>



<a name="195851611"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851611" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851611">(Apr 30 2020 at 15:00)</a>:</h4>
<p>In three weeks today I’ll be done with exams and can get back to working on this, but if we want to land this sooner then I’m happy for someone to rebase it and polish it off. Keep me in the loop because I’m still interested in seeing it through.</p>



<a name="195851634"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851634" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851634">(Apr 30 2020 at 15:00)</a>:</h4>
<p>just in terms of not having e.g. additions and removals of <code>impl { }</code> cause such different cgu partitionings</p>



<a name="195851734"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851734" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851734">(Apr 30 2020 at 15:01)</a>:</h4>
<p>well the hour is up</p>



<a name="195851767"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851767" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851767">(Apr 30 2020 at 15:01)</a>:</h4>
<p>e.g. of something the initial implementation doesn't detect: <code>Vec::&lt;T&gt;::len</code> doesn't depend on <code>T</code> (but everything during its codegen would need to know <code>T: Sized</code>, i.e. have a valid <code>ParamEnv</code>)</p>



<a name="195851796"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851796" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851796">(Apr 30 2020 at 15:01)</a>:</h4>
<p>I think the answer is that we are not ready to land <span class="user-mention" data-user-id="116107">@davidtwco</span> 's work as is, but we should have follow-up discussion about how to do so</p>



<a name="195851836"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851836" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851836">(Apr 30 2020 at 15:01)</a>:</h4>
<p>can maybe the WG-mir-opt take charge on that? does that make sense?</p>



<a name="195851967"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851967" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851967">(Apr 30 2020 at 15:02)</a>:</h4>
<p>(we could even just decide to wait until <span class="user-mention" data-user-id="116107">@davidtwco</span> is back from exams before we try to do anything with it. I doubt we need to rush to land it, right?)</p>



<a name="195851995"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195851995" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195851995">(Apr 30 2020 at 15:02)</a>:</h4>
<p>I think it would make sense to fold the work into wg-mir-opt and retire the dedicated working group now.</p>



<a name="195852002"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852002" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852002">(Apr 30 2020 at 15:02)</a>:</h4>
<p>does make sense, but I don't know where to take the time from to actually give this the attention it deserves</p>



<a name="195852048"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852048" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852048">(Apr 30 2020 at 15:03)</a>:</h4>
<p>I think waiting is fine, I'm not sure I'll even get to take another look at it in the next couple weeks</p>



<a name="195852065"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852065" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852065">(Apr 30 2020 at 15:03)</a>:</h4>
<p>I don't think there's an urgent rush and I would be happy to help <span class="user-mention" data-user-id="116107">@davidtwco</span> where I can</p>



<a name="195852106"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852106" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852106">(Apr 30 2020 at 15:03)</a>:</h4>
<p>okay that's great</p>



<a name="195852128"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852128" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852128">(Apr 30 2020 at 15:03)</a>:</h4>
<p>Also, one more thing</p>



<a name="195852161"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852161" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852161">(Apr 30 2020 at 15:03)</a>:</h4>
<p>may be able to spend some time on it, let's continue discussing in <a class="stream" data-stream-id="189540" href="/#narrow/stream/189540-t-compiler.2Fwg-mir-opt">#t-compiler/wg-mir-opt</a></p>



<a name="195852172"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852172" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852172">(Apr 30 2020 at 15:03)</a>:</h4>
<p>Thanks again to <span class="user-group-mention" data-user-group-id="2403">@WG-prioritization</span> for working yesterday to establish the agenda for today's meeting</p>



<a name="195852203"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852203" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852203">(Apr 30 2020 at 15:04)</a>:</h4>
<p>and for all their work on making an asynchronous process for prioritization</p>



<a name="195852286"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852286" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852286">(Apr 30 2020 at 15:04)</a>:</h4>
<p>I don't know how many people are watching the t-compiler/wg-prioritization stream</p>



<a name="195852342"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852342" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852342">(Apr 30 2020 at 15:04)</a>:</h4>
<p>but I think it serves as an interesting case study</p>



<a name="195852355"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852355" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852355">(Apr 30 2020 at 15:04)</a>:</h4>
<p>Staring at it xD</p>



<a name="195852428"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852428" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852428">(Apr 30 2020 at 15:05)</a>:</h4>
<p>in how to move from a high-bus factor individually-driven process  to a ... "low" bus factor group-driven one</p>



<a name="195852460"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852460" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852460">(Apr 30 2020 at 15:05)</a>:</h4>
<p>time will tell if it pays off or not</p>



<a name="195852488"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852488" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852488">(Apr 30 2020 at 15:05)</a>:</h4>
<p>well, that's not fair</p>



<a name="195852523"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852523" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852523">(Apr 30 2020 at 15:05)</a>:</h4>
<p>its definitely paid off, <strong>for me</strong></p>



<a name="195852586"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852586" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852586">(Apr 30 2020 at 15:06)</a>:</h4>
<p>but <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> made a good point to me earlier to</p>



<a name="195852596"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852596" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852596">(Apr 30 2020 at 15:06)</a>:</h4>
<p>today</p>



<a name="195852649"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852649" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852649">(Apr 30 2020 at 15:06)</a>:</h4>
<p>which is: The time that group is putting in</p>



<a name="195852672"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852672" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852672">(Apr 30 2020 at 15:06)</a>:</h4>
<p>is all about making <strong>this</strong> meeting useful</p>



<a name="195852679"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852679" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852679">(Apr 30 2020 at 15:06)</a>:</h4>
<p>and efficient</p>



<a name="195852715"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852715" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852715">(Apr 30 2020 at 15:06)</a>:</h4>
<p>so, we should all be reflecting on where this meeting fails to achieve those goals</p>



<a name="195852742"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852742" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852742">(Apr 30 2020 at 15:07)</a>:</h4>
<p>(thus my aforementioned plans to try to reduce the amount of time we spend discussing low-risk beta backports)</p>



<a name="195852746"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852746" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852746">(Apr 30 2020 at 15:07)</a>:</h4>
<p>anyway</p>



<a name="195852752"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852752" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852752">(Apr 30 2020 at 15:07)</a>:</h4>
<p>I digress</p>



<a name="195852803"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195852803" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195852803">(Apr 30 2020 at 15:07)</a>:</h4>
<p>Thanks to everyone in <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> for attending! This was a great week, you are all great. Stay safe, stay healthy.</p>



<a name="195853253"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853253" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853253">(Apr 30 2020 at 15:10)</a>:</h4>
<p><span class="user-mention silent" data-user-id="119031">Esteban Küber</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846016" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195846016">said</a>:</p>
<blockquote>
<p>Btw, re the doc backport, I proposed it to avoid the wrong documentation ending up in the public facing website.</p>
</blockquote>
<p>hey <span class="user-mention" data-user-id="119031">@Esteban Küber</span> , do you want me to leave the doc backport tagged as beta-nominated, and we can discuss again next week?</p>



<a name="195853300"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853300" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853300">(Apr 30 2020 at 15:10)</a>:</h4>
<p>Sure</p>



<a name="195853310"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853310" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853310">(Apr 30 2020 at 15:10)</a>:</h4>
<p>As you prefer</p>



<a name="195853389"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853389" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853389">(Apr 30 2020 at 15:11)</a>:</h4>
<p>(or maybe i'll just approve it, based on the argument you gave. The basic issue is that every error shows up in our public index, regardless of whether that error is visible in stable code or not, right?)</p>



<a name="195853409"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853409" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853409">(Apr 30 2020 at 15:11)</a>:</h4>
<p>Correct</p>



<a name="195853414"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853414" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853414">(Apr 30 2020 at 15:11)</a>:</h4>
<p>its an interesting stability issue.</p>



<a name="195853560"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853560" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853560">(Apr 30 2020 at 15:12)</a>:</h4>
<p>It is, and a consequence of mixing docs and code, which is not shared by the book for example, only affects the index</p>



<a name="195853595"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195853595" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195853595">(Apr 30 2020 at 15:12)</a>:</h4>
<p>and so the various Web Search Engines (google, bing, duckduckgo, ...) all traverse that index and so would get the bad data in the database that we assume people will be querying?</p>



<a name="195856161"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195856161" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195856161">(Apr 30 2020 at 15:27)</a>:</h4>
<p>Not only that, some people use the index but don't use the rustc output for error codes</p>



<a name="195856190"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195856190" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195856190">(Apr 30 2020 at 15:27)</a>:</h4>
<p>I ran a small poll and it was evenly divided</p>



<a name="195856222"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195856222" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Esteban Küber <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195856222">(Apr 30 2020 at 15:27)</a>:</h4>
<p>Between people who didn't use either at all, used both, and used one or the other</p>



<a name="195913069"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195913069" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Léo Lanteri Thauvin <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195913069">(Apr 30 2020 at 23:02)</a>:</h4>
<p>Is it me or <a href="https://github.com/rust-lang/rust/issues/71488" title="https://github.com/rust-lang/rust/issues/71488">#71488</a> wasn’t labeled as beta-accepted?</p>



<a name="195923737"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195923737" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195923737">(May 01 2020 at 01:42)</a>:</h4>
<p>sorry I got distracted and didn't finish going through the meeting results</p>



<a name="195923743"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195923743" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195923743">(May 01 2020 at 01:42)</a>:</h4>
<p>I usually try to traverse it right after the meeting (since I find that trying to update the issues during the meeting slows it down.)</p>



<a name="195923770"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195923770" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195923770">(May 01 2020 at 01:43)</a>:</h4>
<p>(and also because I like to link to the <a href="http://zulip-archive.rust-lang.org" title="http://zulip-archive.rust-lang.org">zulip-archive.rust-lang.org</a>, which has a bit of a delay to update)</p>



<a name="195969093"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195969093" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195969093">(May 01 2020 at 15:00)</a>:</h4>
<p><span class="user-mention silent" data-user-id="116083">pnkfelix</span> <a href="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850030" title="#narrow/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818/near/195850030">said</a>:</p>
<blockquote>
<p><span class="user-mention silent" data-user-id="125250">Wesley Wiser</span> you use Windows, right? Do you have spare cycles to check if this at least reproduces for you locally?</p>
</blockquote>
<p><span class="user-mention" data-user-id="116083">@pnkfelix</span> I was able to repro on Windows: <a href="https://github.com/rust-lang/rust/issues/71504#issuecomment-622422103" title="https://github.com/rust-lang/rust/issues/71504#issuecomment-622422103">https://github.com/rust-lang/rust/issues/71504#issuecomment-622422103</a></p>



<a name="195969695"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195969695" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195969695">(May 01 2020 at 15:05)</a>:</h4>
<p>Let me know if there's anything more I can help with. This kind of issue is pretty far outside what I know how to debug but I'm very interested in learning!</p>



<a name="195971304"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202020-04-30%20%2354818/near/195971304" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> pnkfelix <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202020-04-30.20.2354818.html#195971304">(May 01 2020 at 15:19)</a>:</h4>
<p>The recipe for reproduction was all I wanted, thanks <span class="user-mention" data-user-id="125250">@Wesley Wiser</span> !!</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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